. >> thanks for joining us. i'm cheryl >>> tonight on "world news," a daughter is free. the american hiker in the arms of her mother. out of prison in iran and speaking, forced to leave her fiance and friend behind. >>> and that crisis on a new tape. the massive california gas explosion. what witnesses thought had happened. >>> a cough syrup crackdown. dr. richard besser explores the way kids are using cough medicine to get high. >>> and what a special delivery. a baby girl, just born to one of the trapped miners in chile. the name they gave her says so much. >>> good evening. for 410 days, a 32-year-old american woman was imprisoned in iran. a hiker charged as a spy while her mother, nora, waited and prayed. well, tonight, sarah shourd is coming home, free. amid questions about her health, and the fate of the young americans left behind. one of them, her fiance. our jim sciutto has traveled to iran eight times and he's been following the hikers' story from the start. jim? >> reporter: well, diane, her detention became a powerful symbol of the wider standoff between the